The ISP sends the CPE and Router Advertisement (RA), which advertises the IPv6 prefix. The customer router uses the prefix and fills the remaining part by either random or with EUI-64.

How does stateless and stateful DHCPv6 work?

It is used when not only an IPv6 address but i.e. DNS server IP is needed for the customer. DHCPv6 uses SLAAC but the RA has the other-config-flag set, which tells the router to check with a DHCP server to obtain additional IPv6 information.

Since stateless DHCPv6 uses SLAAC it does not know the actual IPv6 addresses of the routers. Stateful DHCPv6 sets the managed-config-flag to instruct the router to obtain its IPv6 address from the DHCPv6 server.

How does DHCPv6 PD work?

It can assign multiple IPv6 networks to a router. The router could then assign those different IPv6 network to its various interfaces.

How do you configure IPv6 address and IPv6 default route?

ipv6 address IP/prefix-length

ipv6 route ::/0 next-hop-ipv6-address

What is the difference between IPv6 and IPv4 ACL?

IPv6 ACLs are named and extended by default

IPv4 ACL has implicit deny at the end
IPv6 ACL has 3 implicit entries: permit icmp any any nd-na permit icmp any any nd-ns deny ipv6 any any(Neighbor Discovery (like ARP) and Neighbor Solicitations)

BGP Support for IPv6

Which version of BGP supports IPv6?

Multiprotocol BGP (MP-BGP)

What are the two ways of using IPv6 on BGP?

configuring IPv4 BGP session and use that single session to carry IPv4 and IPv6 route information